Which of the Following Sentences Provides an Example of Effective

Which of the following sentences provides an example of effective diction?

A) A good writer will only use big words when necessary.
B) The shrewd author will always endorse himself by providing imposing and superlative language.
C) As I struggled to carry my instruments across the vast expanse of the project area, I paused to reflect on the magnificence of the setting sun.
D) All of the above